package com.lishui.wateroj.interceptor;

import com.lishui.wateroj.contant.UserConstant;
import com.lishui.wateroj.model.context.BaseContext;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 * 登录拦截器
 */
@Component
@Slf4j
public class LoginInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        log.info("验证登录");
        //1. 判断当前拦截到的是Controller的方法还是其他资源
        if (!(handler instanceof HandlerMethod)) {
            //当前拦截到的不是动态方法，直接放行
            return true;
        }
        //2. 判断是否登录,不通过响应401
        HttpSession session = request.getSession();
        if (session == null || session.getAttribute(UserConstant.USER_LOGIN_STATE) == null) {
            log.error("未登录，验证失败");
            response.setStatus(401);
            return false;
        }
        log.info("已登录，验证成功");
        BaseContext.setCurrentId((Long) session.getAttribute(UserConstant.USER_LOGIN_STATE));
        return true;
    }

    // 执行完最好清除一下线程中的变量
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        BaseContext.removeCurrentId();
    }
}
